Patch for "master" branch: https://reviews.mahara.org/11069

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https://bugs.launchpad.net/bugs/1824386

Title:
  Inappropriate comparison for DB versions

Status in Mahara:
  In Progress

Bug description:
  Relevant code from htdocs/init.php

      if (is_postgres()) {
          $okversion = '8.3';
          $dbfriendlyname = 'PostgreSQL';
      }
      else if (is_mysql()) {
          $okversion = '5.0.25';
          $dbfriendlyname = 'MySQL';
      }
      if (floatval($dbversion['version']) <  floatval($okversion)) {
          throw new ConfigSanityException(get_string('dbversioncheckfailed', 
'error', $dbfriendlyname, $dbversion['version'], $okversion));
      }

  
  floatval() on those strings will return, at best, the major version number, 
and while I think it's unlikely that people are going to be running 19.04 on 
PGSQL 8.2, right now the system wouldn't be able to detect that.

  Switching out to version_compare would be a proper and safe comparison
  for this.

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